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Debt - Short-Term Borrowings (Details) - USD ($)
$ in Thousands
Jul. 31, 2020
Jul. 31, 2019
Debt Instrument [Line Items]    
Short-term borrowings $ 0 $ 43,000
Ferrellgas, L.P. [Member]    
Debt Instrument [Line Items]    
Short-term borrowings $ 0 $ 43,000